Hot take #1 using mod powers to get the first post of gen8
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Before any bans are discussed for tiering purposes during the quickban stage I think Dynamax as a mechanic needs to be assessed. On paper, Dynamax is very overwhelming and impactful to the game that it drastically affects how games turns out. Pokemon that would not (necessarily) be broken on any individual type are extremely threatening with little to no counter play with Dynamax, especially given the Monotype environment. Although it's only Day 2, I think that a huge amount of individual Pokemon would need to be banned if Dynamax stays.
This, however, is a very tricky subject as it is such a huge part of Generation 8, banning a whole mechanic early in the life of the metagame could be a bit controversial. What truly is enough time to assess if it's broken given that it's brand new? On the flip side, I do not think that quickbans can begin until a decision is made on Dynamax. But, let's look at a couple of different aspects of Dynamax that make it seem overwhelming on paper:
Dynamax + Choice item
As shown in
this video, if you have a Choice item equipped on your Pokemon and then Dynamax, you are not limited to only 1 move.
This effectively means that your Pokemon has +1 Speed/Attack/Special Attack (depending on the item you're using) for free without being locked into only 1 move, one of the balancing factors of Choice items themselves. Powerful items have negative effects for a reason. This makes trying to check Pokemon that use Dynamax much more difficult, especially for those using Choice Band/Specs as your typical defensive check that relies on resisting the move they locked into now has to deal with the Pokemon's other coverage moves, not to mention those moves being boosted in damage themselves.
Edit: Strikethrough for the part that apparently isn't true.
Stat boosting Dynamax moves
Not all Dynamax moves were created equally. The ones that boost your own Pokemon's stats are incredibly impactful to the way the battle turns out and what the opponent can even do to deal with said Pokemon. Some examples would be Fighting boosting Attack, Flying boosting Speed, and Poison boosting Special Attack. While the Poison one is less impactful as Poison is generally a bad/rare coverage move, the other two are extremely threatening, especially Flying.
Any Pokemon with decent Speed, natural access to a primary offensive-boosting move, and an at least halfway decent Flying-type attack becomes incredibly threatening with Dynamax. Togekiss is a great example of a Pokemon like this. Access to Nasty Plot means that it can immediately gain +2 Special Attack and then go Dynamax the next turn and start blasting out STAB Dynamax Flying moves that are not only incredibly powerful, but also give it +1 Speed on each use, making it increasingly difficult to deal with. What makes it even harder to deal with is the increased HP values from going Dynamax, as described next. While Togekiss is only one example, this holds true for basically any Pokemon with a Flying-type move that they can afford to run, meaning there's the potential for a plethora of Pokemon to be broken for a similar reason.
Fighting Dynamax moves are similarly powerful but rather look for Pokemon with moves that boost their Speed or have naturally high Speed to make them difficult to deal with. An example off the top of my head would be Barraskweda. With incredibly high Speed, let alone under Rain, it can freely dish out a Fighting type Dynamax move or two to get +1/+2 Attack and then start blasting out STAB Water Dynamax moves (that also set Rain) to blast through teams when given the opportunity. For certain teams, there's hardly any counterplay for this, especially in Monotype. It goes even further when you consider that the Barraskewda in question could even be using a Choice Band to further bolster its naturally high Attack.
Weather/Terrain
Generally, I think the Dynamax moves that set weather or a terrain upon use are much less of a problem on their own. The problem is more when you combine it with the stat boosting and increased HP values. Teams that are built around weather status become even more difficult to deal with as now you have to ALSO deal with weather abusers being able to set the weather themselves without any negative.
Generally, I don't think Sand is a problem outside of Excadrill (who is a big problem on his own), but you can't necessarily say the same about Rain. Rain has a good chunk of Pokemon with Swift Swim that can abuse Rain in this generation. With Dynamax, these Pokemon don't even require Rain to be already on the field in order to become effective. By Dynamaxing, they can set their own Rain with offensive moves and re-set it every turn of Dynamax if your opponent removes it. It's way too much compression of factors that kept Rain in check in previous generations. The only real effective means of dealing with this would be to cancel their weather by using a Dynamax Fire/Ice/Rock move to change the weather, but already 2 of those 3 are resisted by Water, meaning you're doing next to no damage just to cancel Rain. That being said, the Ice/Hail version is not broken inherently either for similar reasons to Sand (ie, not boosting your type's attacks on top of boosting Speed with abilities).
While I haven't played around with Sun or Terrains yet, I can see them also being potentially broken for similar reasons to Rain (ie, boosting type damage), but without the factor of boosting your Pokemon's Speed through ability either. However, Sun in particular is dangerous due to Pokemon like Charizard that take advantage of Solar Power along with boosted Fire damage from Sun.
Dynamax HP Values
The increasing HP value upon Dynamax only further exacerbates the issues laid out above. When going Dynamax, your HP pool doubles, which makes it even more difficult to check these Pokemon. By effectively doubling your bulk, typical offensive checks won't work as they often won't deal enough damage to take down the Pokemon in question any more. The doubled bulk makes it even easier to "get away" with the scenarios I described above, where you use a stat boosting move prior to Dynamaxing so long as the Pokemon you're against does not immediately threaten you, which often is the case.
How to deal with Dynamax Pokemon?
Obviously there are ways to deal with Dynamax Pokemon as a whole - the problem is that the majority of types do not have this ability.
Personally, I don't think there's any reliable check to the Choice item problem listed above, beyond having your own Choiced Pokemon to expend for Dynamax that happens to beat the one they're using. Choice Band/Specs into Dynamax means defensive checks likely won't work anymore (obviously case by case) as theyre free to use whatever coverage they want
and the Choice Scarf variant means offensive checks likely won't work either unless your Pokemon happens to be faster still AND you're most likely forced into Dynamax as well.
To deal with the stat boosting variant, there's hardly any counter play. The best you could do is Haze, which is shakey at best given that Haze Pokemon are typically very slow meaning they have to be able to take the oncoming move in the first place, not to mention needing to sack Pokemon just to get them in safely. Phaze will not work as you cannot Whirlwind or Roar out a Dynamax Pokemon. Unaware is so rare this generation that I don't think it's even worth mentioning, and Quagsire itself likely won't be able to check these Pokemon as they're using boosted BP moves.
So realistically, the best you could do is hope that your own Dynamax Pokemon beats your opponents and if it doesn't...well...too bad. Given the limitations of Monotype as a metagame in the first place, I think Dynamax has the potential to be way too much.
Take Home Message
As I mentioned, it's still only Day 2 of the metagame and therefore Dynamax has hardly had enough time to be tested. At the risk of looking like a fool, there are a lot of factors
on paper that make Dynamax incredibly dangerous, especially in the Monotype environment. I think a very careful and scrutinizing eye needs to be placed on Dynamax as we progress through the early stages of the metagame, especially before anything else is quick banned.